Study On New Meat Breed (Strain) Of Optimum Breeding Scheme For Qinchuan Cattle

It is expected that the inclusion of high quality and high yield in the breeding objective has some consequences on the design of progeny testing scheme in Qinchuan cattle. The breeding objective traits of Qinchuan cattle were studied and determined by system analysis method. The marginal profit for each objective trait was estimated using the balance method and the relative computing formula for the objective traits were presented also. A complex deterministic approach (ZPLAN), which is based on the gene flow theory and systematic analysis theory, was used to optimize the opened nucleus breeding programs for NMCG. Annual monetary genetic gain and breeding profit were used to evaluate alternative breeding strategies. On the base of analyzing the expected breeding effects of current breeding scheme, the following factors which affect annual monetary genetic gain and discounted profit are considered: size of population, structure of breeding system, pattern of use of seedstock. The strategies to improve current breeding scheme and optimized breeding plan were proposed:1. The research analyzes the growth capability, reproduction capability, expenses of feed and management, energy need, feed using and energy-containing of feed, and various feed using of Qinchuan cattle. Combining condition of Qinchuan cattle production, breeding, market and further developing trend, calculated the marginal profit of the three kind traits-growth, carcass quality and reproduction by balance method and confirmed the breeding goal traits. These characters'economic weighting including traits-growth, reproduction and carcass quality were measured. The ratio of relevant economic importance of the three kinds of traits-growth, reproduction and carcass quality is 63%∶26%∶11% and approximates 6∶2∶1. The ratio of relevant economic importance of the nine objective traits-birth weight, yearling weight, 18-month weight, fattening daily gain, growth ability, the age of first calving, calving interval, carcass quality and marbling, is 5%, 23%, 20%, 7%, 8%, 14%, 12%, 6% and 5%. So growth traits occupy larger economic weight, better than reproductive traits and carcass traits. It is important to select growth traits in the selection process of Qinchuan cattle as beef cattle.2. Optimum analysis result proved that the return for the annual monetary genetic gain is 46.8036 for each calving period, current breeding scheme is $211.7192, breeding input is $31.3104, the breeding profit is $180.4088, the mean generation internal of the population is 5.4706 years, and the ratio of input and return are 1:6.76. Compared with domestic and foreign research kept...